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Re: [Matplotlib-users] ValueError: x and y must have same first dimension
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From: Daπid <dav...@gm...> - 2012-07-27 23:12:07
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I guess it is showing, but you have many data points, so the gaussian is too small down there. You have to increase its values to make both areas fit: plt.plot(bins, N*(bins[1]-bins[0])*y, 'r--', linewidth=1) And you will get a nice gaussian fitting your data. On Fri, Jul 27, 2012 at 11:12 PM, surfcast23 <sur...@gm...> wrote: > > Thanks for catching that sigma was still a vector! I am no longer getting the > errors, but the best fit line is not showing up.Is there something else I am > missing ? > BTW thanks for the heads up on the np.mean and np.standard functions. > > Khary > > Daπid wrote: >> >> On Fri, Jul 27, 2012 at 9:57 PM, surfcast23 <sur...@gm...> wrote: >>> y = mlab.normpdf( nbins, avg, sigma) >>> l = plt.plot(nbins, y, 'r--', linewidth=1) >>> plt.show() >> >> You should not change bins there, as you are evaluating the gaussian >> function at different values. >> >> Also, sigma is a vector, but it should be an scalar: >> >> sigma = np.sqrt((1./len(C))*(diff**2)) >> >> should be >> >> sigma = np.sum(np.sqrt((1./len(C))*(diff**2))) # The sum of the >> previous >> >> But, much better, you can change the three lines of code by: >> >> avg=np.mean(C) >> sigma=np.std(C) >> >> They are way faster and more numerically accurate and stable. >> >> >> As a rule of thumb, if you want to do something simple, think that >> there should be an easy way of doing it. And if it is something people >> do every day (like taking the mean or the std of a vector, or loading >> from a txt file), there should be a very easy way of doing it. :-) And >> it would probably be faster and more flexible than any naive >> implementation. >> >> >> Good luck with your galaxies! >> >> ------------------------------------------------------------------------------ >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. Discussions >> will include endpoint security, mobile security and the latest in malware >> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >> _______________________________________________ >> Matplotlib-users mailing list >> Mat...@li... >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >> >> > > -- > View this message in context: http://old.nabble.com/ValueError%3A-x-and-y-must-have-same-first-dimension-tp34218704p34222788.html > Sent from the matplotlib - users mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Matplotlib-users mailing list > Mat...@li... > https://lists.sourceforge.net/lists/listinfo/matplotlib-users |
